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View Full Version : Looper Carb HELP!


Laker
05-10-2003, 04:31 PM
I have two sets of carbs... Which ones to use?

First is 393574 bore 1.46 Mains 59, Idle 40, mids NA (Very small) and the mids pickup tube is shorter than Idle... Also has provisions for Vstacks

Second set is 436604 bore 1.48
Mains 73, Idle 31, mids 33 and pullover 98.
This carb has adjustable Idle mixure and no upper mount for Vstacks.

What is the better carb for a mod motor?
just on looks alone the mids on both carbs seem quite small...
HELP
SteveO
05-11-2003, 10:44 AM
check this out... I'm changing over to the one's on the right this season.

2" bores - Do you think it well breath a little easier???

No more mid-range lean, no more decel-knock. Fuel curve adjstment every 250 rpm. Will idle at 500. We'll see how they do in a couple weeks....
Laker
05-11-2003, 01:37 PM
ohh nice!
let us know how she works!
Have you opened up the front half?
what other mods have you done?
SteveO
05-11-2003, 04:52 PM
Just '86 heads and fiber reeds.

Throttle body ID is just a hair smaller than the gasket. Gasket is just a hair smaller than the intake. Close enough that the play in gasket placement would let it block some of the intake if your not careful. Nice.

Wayne says the intake and reeds are the next bottle-neck. Maybe next year...

Long term, I want to clean up the casting flash, & send it out for finger ports. Not ready to tear it down yet.

Main driver for the EFI was the tunablity.
Forkin' Crazy
05-11-2003, 09:12 PM
Wow! That injection sure looks nice. I like the tunable injection for sure. Have you run it yet?
Laker
05-14-2003, 08:42 PM
Steve
Very nice!
this one has been heavly ported, decked, line bored, ballanced bla bla bla
I have several heads for pump fuel and race fuel.
Im sure I will be dealing with the mid range lean issues.
What carbs did you use? One set I have are sst100 carbs. Are you running an EGT?
SteveO
05-18-2003, 08:36 PM
Looks like it should move. I like the 4-stroke hood.
Carbs were P/N 437326.
Yes, I ran an EGT. It wanted to cook at 4-5000 rpm, and any time I took my foot of the gas.

Forkin, only ran it in the driveway. Have a bunch to wrap up, but should be in the water next weekend.